Torque fluctuations caused by upstream mean flow and turbulence

被引:3
作者
Farr, T. D. [1 ]
Hancock, P. E. [1 ]
机构
[1] Univ Surrey, EnFlo Lab, Guildford GU2 5XH, Surrey, England
来源
SCIENCE OF MAKING TORQUE FROM WIND 2012 | 2014年 / 555卷
关键词
D O I
10.1088/1742-6596/555/1/012048
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
A series of studies are in progress investigating the effects of turbine-array-wake interactions for a range of atmospheric boundary layer states by means of the EnFlo meteorological wind tunnel. The small, three-blade model wind turbines drive 4-quadrant motor-generators. Only a single turbine in neutral flow is considered here. The motor-generator current can be measured with adequate sensitivity by means of a current sensor allowing the mean and fluctuating torque to be inferred. Spectra of torque fluctuations and streamwise velocity fluctuations ahead of the rotor, between 0.1 and 2 diameters, show that only the large-scale turbulent motions contribute significantly to the torque fluctuations. Time-lagged cross-correlation between upstream velocity and torque fluctuations are largest over the inner part of the blade. They also show the turbulence to be frozen in behaviour over the 2 diameters upstream of the turbine.
引用
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页数:7
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